The Homemade Heat Pump Manifesto

[AC_Hacker]

Originally Posted by Mobile Master Tech

I've been doing research to understand the potential risk of flammable refrigerants for our heat pumps, such as R290 we've discussed here. The automotive industry is phasing in R1234yf which is mildly flammable. Daimler originally said they wouldn't use it in their cars because they could repeat fires and a corrosive acid cloud during their testing. Other manufacturers were satisfied with their tests, the SAE and others decided the risk was so small even airbags posed much more risk, and Daimler has since backed down....

There is already a thread on EcoRenovator called something like "Propane as a Refrigerant". It was intended to discourage people from using Propane. It contains much of the information you have just posted.

-AC